Here is a recent study showing the impact of emotional content and user engagement.

It is pointed out that {“part of what makes emotional content so susceptible to spreading is that emotions themselves are contagious and positive emotions best negative ones, any emotion bests none at all.”}

“You’re going to be able to turn your Android phone into a great social device,” Zuckerberg said at the unveiling. “Our phones today are designed around apps, not people. We want to flip that around.”

Android users who have the most recent Facebook app will see a link asking them if they want to download Facebook Home. It downloads as a separate app and will be available April 12.

According to Zuckerberg, Facebook Home will be available only for certain specific phones at launch. A tablet version is expected to come at a later date. Facebook Home is optimized for the HTC One and One X, and the Samsung Galaxy S III, Galaxy S 4 and Note II,

HTC also unveiled the HTC First phone with Facebook Home pre-loaded. Currently AT&T is the launch partner for Home, and will carry the HTC First. It’ll be available April 12 for $99.99, in the US with a two-year contract.